Chemistry

Organic Chemistry Fundamentals

287 Questions

Organic chemistry fundamentals cover the structure, properties, and reactions of carbon containing compounds. The questions explore functional groups, isomerism, homologous series, and basic reaction mechanisms. This forms the basis of general chemistry across multiple examination formats.

Functional groupsIsomerism typesHomologous seriesCycloalkanesOrganic monomers

Organic Chemistry Fundamentals Questions

Multiple choice

n-Pentane and iso pentane represent

  1. homologues.

  2. structural isomers.

  3. same compound.

  4. different compound.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

n-Pentane and isopentane have the same molecular formula (C5H12) but different structural arrangements of their carbon chains. Therefore, they are structural isomers.

Multiple choice

If the ligands are present at the same side then, the isomer is called as

  1. ionization isomers

  2. optical isomers

  3. trans isomers

  4. cis isomers
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When two identical groups (ligands) occupy adjacent positions, the isomer is called cis. It is not possible for co-ordination number of 2 and 3 and for tetrahedral complexes of co-ordination number 4. It is common in square planar and octahedral complexes. 

Multiple choice

Ring forming ligands are called as

  1. π- acid ligands

  2. ambidentate ligands

  3. bidentate ligands

  4. chelating ligand
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When polydentate ligands bind to the central metal ion, they form a ring called chelate and the ligand is referred as chelating ligand.

Multiple choice

d & l are the isomers found in

  1. hydrate isomerism

  2. optical isomerism

  3. coordination isomerism

  4. geometrical Isomerism
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Optical isomers rotate the plane of polarised light in opposite directions. They are called dextro and laevo (d and l) rotatory depending upon the direction in which plane polarised light is rotated .

Multiple choice

Which of the following is used in the production of synthetic resins and rubber adhesives?

  1. Cyclohexene

  2. 1,3,5,7-Cyclooctatetraene

  3. Cyclopentadiene

  4. Cyclopentane
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cyclopentane is used in the manufacture of synthetic resins and rubber adhesives and also as a blowing agent in the manufacture of polyurethane insulating foam, as found in many domestic appliances such as refrigerators and freezers, replacing environmentally damaging alternatives such as CFC-11 and HCFC-141b.

Multiple choice

The minimum number of carbon atoms that must be present in an alkene is

  1. 1

  2. 2

  3. 3

  4. 4
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Alkenes are the carbon compounds with at least one double covalent bond between their carbon atoms. Double covalent bonds are formed when each atom contributes two electrons. Carbon cannot form a double covalent bond with hydrogen as hydrogen has only one valence electron. Therefore, alkene containing one carbon (i.e. methane) does not exist. The minimum number of carbon atoms that must be present in an alkene is two. Ethene (C2H4) is the simplest alkene containing two carbon atoms. 

Multiple choice

Which set of molecules is expect to be of amphoteric nature?

  1. Al(OH)3, Al2O3, GeO

  2. H2SiO3, SiO2, CO2

  3. Mg(OH)2, PbO, PbO2

  4. PbO, PbO2, GeO

  5. SiO2, GeO, PbO2
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Al(OH)3 is amphoteric hydroxide, Al2O3 is amphoteric oxide and GeO is amphoteric oxide. Hence, Al(OH)3, Al2O3 and GeO are all expected to be of amphoteric nature.